Use of 690 V for LV industrial distribution network to save capital cost and improve network efficiency

The paper has illustrated the economical benefits that can be achieved, in industrial installation, by replacing the most common 400 V system with 690 V. The k-point in capital cost saving is the lower cost of 690 V motor (from 20 to 60% less) compared to the corresponding 6000 V motor. The aim of the study was to verify the real convenience to make use of 690 V rather than 400 V, taking into account the impact on the market; the results allowed to state some general rules that can be used for any specific installations.